/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceFragment;
import android.util.Log;
import android.widget.Button;
/**
* Base class for Settings fragments, with some helper functions and dialog management.
*/
public class SettingsPreferenceFragment extends PreferenceFragment implements DialogCreatable {
private static final String TAG = "SettingsPreferenceFragment";
private SettingsDialogFragment mDialogFragment;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
/*
* The name is intentionally made different from Activity#finish(), so that
* users won't misunderstand its meaning.
*/
public final void finishFragment() {
getActivity().onBackPressed();
}
// Some helpers for functions used by the settings fragments when they were activities
/**
* Returns the ContentResolver from the owning Activity.
*/
protected ContentResolver getContentResolver() {
return getActivity().getContentResolver();
}
/**
* Returns the specified system service from the owning Activity.
*/
protected Object getSystemService(final String name) {
return getActivity().getSystemService(name);
}
/**
* Returns the PackageManager from the owning Activity.
*/
protected PackageManager getPackageManager() {
return getActivity().getPackageManager();
}
@Override
public void onDetach() {
if (isRemoving()) {
if (mDialogFragment != null) {
mDialogFragment.dismiss();
mDialogFragment = null;
}
}
super.onDetach();
}
// Dialog management
protected void showDialog(int dialogId) {
if (mDialogFragment != null) {
Log.e(TAG, "Old dialog fragment not null!");
}
mDialogFragment = new SettingsDialogFragment(this, dialogId);
mDialogFragment.show(getActivity().getFragmentManager(), Integer.toString(dialogId));
}
public Dialog onCreateDialog(int dialogId) {
return null;
}
protected void removeDialog(int dialogId) {
// mDialogFragment may not be visible yet in parent fragment's onResume().
// To be able to dismiss dialog at that time, don't check
// mDialogFragment.isVisible().
if (mDialogFragment != null && mDialogFragment.getDialogId() == dialogId) {
mDialogFragment.dismiss();
}
mDialogFragment = null;
}
/**
* Sets the OnCancelListener of the dialog shown. This method can only be
* called after showDialog(int) and before removeDialog(int). The method
* does nothing otherwise.
*/
protected void setOnCancelListener(DialogInterface.OnCancelListener listener) {
if (mDialogFragment != null) {
mDialogFragment.mOnCancelListener = listener;
}
}
/**
* Sets the OnDismissListener of the dialog shown. This method can only be
* called after showDialog(int) and before removeDialog(int). The method
* does nothing otherwise.
*/
protected void setOnDismissListener(DialogInterface.OnDismissListener listener) {
if (mDialogFragment != null) {
mDialogFragment.mOnDismissListener = listener;
}
}
public static class SettingsDialogFragment extends DialogFragment {
private static final String KEY_DIALOG_ID = "key_dialog_id";
private static final String KEY_PARENT_FRAGMENT_ID = "key_parent_fragment_id";
private int mDialogId;
private Fragment mParentFragment;
private DialogInterface.OnCancelListener mOnCancelListener;
private DialogInterface.OnDismissListener mOnDismissListener;
public SettingsDialogFragment() {
/* do nothing */
}
public SettingsDialogFragment(DialogCreatable fragment, int dialogId) {
mDialogId = dialogId;
if (!(fragment instanceof Fragment)) {
throw new IllegalArgumentException("fragment argument must be an instance of "
+ Fragment.class.getName());
}
mParentFragment = (Fragment) fragment;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mParentFragment != null) {
outState.putInt(KEY_DIALOG_ID, mDialogId);
outState.putInt(KEY_PARENT_FRAGMENT_ID, mParentFragment.getId());
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
if (savedInstanceState != null) {
mDialogId = savedInstanceState.getInt(KEY_DIALOG_ID, 0);
int mParentFragmentId = savedInstanceState.getInt(KEY_PARENT_FRAGMENT_ID, -1);
if (mParentFragmentId > -1) {
mParentFragment = getFragmentManager().findFragmentById(mParentFragmentId);
if (!(mParentFragment instanceof DialogCreatable)) {
throw new IllegalArgumentException(
KEY_PARENT_FRAGMENT_ID + " must implement "
+ DialogCreatable.class.getName());
}
}
// This dialog fragment could be created from non-SettingsPreferenceFragment
if (mParentFragment instanceof SettingsPreferenceFragment) {
// restore mDialogFragment in mParentFragment
((SettingsPreferenceFragment) mParentFragment).mDialogFragment = this;
}
}
return ((DialogCreatable) mParentFragment).onCreateDialog(mDialogId);
}
@Override
public void onCancel(DialogInterface dialog) {
super.onCancel(dialog);
if (mOnCancelListener != null) {
mOnCancelListener.onCancel(dialog);
}
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
if (mOnDismissListener != null) {
mOnDismissListener.onDismiss(dialog);
}
}
public int getDialogId() {
return mDialogId;
}
@Override
public void onDetach() {
super.onDetach();
// This dialog fragment could be created from non-SettingsPreferenceFragment
if (mParentFragment instanceof SettingsPreferenceFragment) {
// in case the dialog is not explicitly removed by removeDialog()
if (((SettingsPreferenceFragment) mParentFragment).mDialogFragment == this) {
((SettingsPreferenceFragment) mParentFragment).mDialogFragment = null;
}
}
}
}
protected boolean hasNextButton() {
return ((ButtonBarHandler)getActivity()).hasNextButton();
}
protected Button getNextButton() {
return ((ButtonBarHandler)getActivity()).getNextButton();
}
public void finish() {
getActivity().onBackPressed();
}
public boolean startFragment(
Fragment caller, String fragmentClass, int requestCode, Bundle extras) {
if (getActivity() instanceof PreferenceActivity) {
PreferenceActivity preferenceActivity = (PreferenceActivity)getActivity();
preferenceActivity.startPreferencePanel(fragmentClass, extras,
R.string.lock_settings_picker_title, null, caller, requestCode);
return true;
} else {
Log.w(TAG, "Parent isn't PreferenceActivity, thus there's no way to launch the "
+ "given Fragment (name: " + fragmentClass + ", requestCode: " + requestCode
+ ")");
return false;
}
}
}